Kdjykuj

I have written some helper functions, which does some database inserts
The problem is I am calling all these functions from my phtml which gets loaded first time when My account is loaded for the first time.

Due to this, the changes on databases doesn't reflect on the first go, when I reload my page again then I see those changes.

There must be some block file which loads before My account phtml file so that I can call my helper function from that block file.

Where can I find those block files/ controller files of My Account and how can i call my helper function from those

Right now i am calling my helper function from my phtml like this:-

$temp_block = $this->getLayout()->createBlock('YXCatalogBlockOrderHelper');

$customerHelper = $this->helper('YXCustomerHelperCustomerHelper');

 if (!($customerHelper->isCustomer())){

     $customerID = $customerHelper->getCustomerId();

     $orderId = $customerHelper->getOrderId();

     $temp_block->guestToCustomer($orderId,$customerID);



 }

A page can be single or combination of mutiple templates ie., phtml and each templates represent a block.
And here in this question you were asking for customer account section which contains title, sidebar, customer information and address information etc..,
So each of which is rendering from different templates and obviously different blocks as well.

MagentoThemeBlockHtmlTitle.php - Title

and

MagentoCustomerBlockAccountDashboardInfo.php - Dashboard Info

and for customer address section

MagentoCustomerBlockAccountDashboardAddress.php - Address Book Section

If you want to know the templates and block which loads in a page means, try this option

Login to Admin -> go to Stores->Configuration->Advanced->Developer->on the right side section ->Debug -> Enabled Template Path Hints for Storefront and Add Block Class Type to Hints then refresh then frontend it will display the path hints of files which exist there.

Hope this helps,
Peace :)

If you are talking about the dashboard page, Then please open on the layout filed

vendor/magento/module-customer/view/frontend/layout/customer_account_index.xml 

vendor/magento/module-customer/view/frontend/layout/customer_account.xml

Here Magento mention, it is a list of file which is loaded for the customer dashboard page.

Also, I don't understand, what you have tried to achieve. But on the fly update customer data and get that data update on the same execution is not a good idea.

And PHP is server-side language, So the content of the page is not updated yet until next execution of the same page. So suggest to update content using AJAX and Implement the private content.